[Bug 1724705] [NEW] Firefox error: "DRM: Failed to create and initialize a MediaKeys object"

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I get an error playing DRM-restricted content with the Firefox 56.0 that
comes with Ubuntu 16.04, but not with the Firefox 56.0 that I download
from Mozilla.

Specifically, if I go to https://bitmovin.com/mpeg-dash-hls-drm-test-
player/ with the Firefox 56.0 included with Ubuntu 16.04, the video box
in the middle of the page displays static with the error message "DRM:
Failed to create and initialize a MediaKeys object". If I instead
download Firefox 56.0 from
https://ftp.mozilla.org/pub/firefox/releases/56.0/linux-x86_64/en-
US/firefox-56.0.tar.bz2 and extract and run that Firefox, the video will
correctly start after I click play.

In both cases Firefox is configured with:
* about:preferences > "Play DRM-controlled content" checked
* about:addons > "Widevine Content Decryption Module provided by Google Inc." v1.4.8.1008 installed and set to "Always Activate"

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

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Firefox error: "DRM: Failed to create and initialize a MediaKeys object"
https://bugs.launchpad.net/bugs/1724705
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